Peakflow Forecasts Header

SF STILLAGUAMISH--AT JORDAN ROAD
   State:  Washington    County:  SNOHOMISH
   Latitude:  48 5' 43" North    Longitude:  121 58' 27" West
   Elevation:  195 feet
   Supporting WFO:  Seattle    
   Action Stage:  210'   Flood Stage:  211'   Moderate Flood Stage:  212.5'
   Major Flood Stage:  213.5'

Forecasts are calculated from a forecast time series that approximates flow at a 6 hour time step interval. Observed instantaneous peaks can be higher than model forecast peaks.

SF STILLAGUAMISH--AT JORDAN ROAD   (SSFW1)
Forecasts for Water Year 2026
Ensemble Date: 2026-09-08
 Forecast Period: September 8 to January 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 206.43 6591 2026-10-15
90 % 207.26 8611 2026-10-22
70 % 208.12 11252 2026-11-12
50 % 208.83 13975 2026-11-25
30 % 209.70 17284 2026-12-07
10 % 211.22 24211 2026-12-19
05 % 212.76 32472 2026-12-26

Peakflow exceedence plot for SSFW1

 Click to download runoff traces used in forecast.  Click for comma delimited data used in plot.csv icon